Life, in itself is a journey. It matters not if your aspirations are to be a doctor, an astrophysicist or a lawn care specialist.
In any journey, there will be ups and downs. There will be "smooth sailings' and rough patches. Doors will be opened for you and doors will shut in your face. What ultimately matters is that you complete whatever journey it is you set off on. You fail 100% of the chances you don't take.
Take the first step. Get started on your journey.